SN74BCT646DW Equivalent & Substitute Parts

Part Overview

The SN74BCT646DW is a non-inverting transceiver logic integrated circuit manufactured by Texas Instruments. It functions as a 1-element, 8-bit per element transceiver with 3-state output capability, housed in a 24-SOIC surface mount package. The device operates within the 4.5V to 5.5V supply voltage range and is rated for 0°C to 70°C operating temperature.

The SN74BCT646DW is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

SN74BCT646DW

Texas InstrumentsIn Stock: 2341SN74BCT646DW Datasheet

Current PartRFQ

SN74BCT543DW

Texas InstrumentsIn Stock: 1010SN74BCT543DW Datasheet

Parametric EquivalentRFQ

SN74BCT652DW

Texas InstrumentsIn Stock: 848SN74BCT652DW Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74BCT646DW are identified based on strict parametric equivalence. The following criteria determine substitution eligibility:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 15mA, 64mA
• Voltage - Supply: 4.5V ~ 5.5V
• Operating Temperature: 0°C ~ 70°C (TA)
• Package / Case: 24-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount

Both identified substitute parts meet all of these electrical and mechanical parameters. The primary distinction between the main part and substitutes is product status and availability.

Parameter Comparison

Engineering Selection Recommendations

Both SN74BCT543DW and SN74BCT652DW are parametrically equivalent to the SN74BCT646DW and are suitable for direct substitution based on electrical and mechanical specifications.

The primary advantage of selecting either substitute part is product status. Both SN74BCT543DW and SN74BCT652DW are classified as Active, ensuring ongoing availability and supply chain support. The SN74BCT646DW, being obsolete, presents long-term sourcing challenges.

All three parts maintain identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited). This ensures regulatory and environmental compliance requirements are maintained across substitution.

Frequently Asked Questions (FAQ)

Q: Can SN74BCT543DW or SN74BCT652DW be used as direct replacements for SN74BCT646DW?

A: Yes. Both parts are parametrically equivalent across all electrical and mechanical specifications, including logic type, bit configuration, output characteristics, supply voltage, operating temperature range, and 24-SOIC package dimensions. Direct substitution is supported without circuit modification.

Q: What is the difference between SN74BCT543DW and SN74BCT652DW?

A: Both parts are parametrically identical in all electrical and mechanical parameters provided. The selection between them should be based on availability and inventory status.

Q: Are there any compliance or certification differences between the main part and substitutes?

A: No. All three parts maintain identical compliance status: ROHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited). Regulatory and environmental requirements are preserved across substitution.

Q: Why is the SN74BCT646DW classified as obsolete?

A: Product status is determined by the manufacturer. The obsolete classification indicates that Texas Instruments has discontinued active production and support for this part number. Active alternatives are available with identical specifications.

Q: Are the package dimensions identical across all three parts?

A: Yes. All three parts use the 24-SOIC package with 0.295" width and 7.50mm width specification. PCB footprints and mounting requirements are identical.